Open-Loop Control Co-Design of Semisubmersible Floating Offshore Wind Turbines Using Linear Parameter-Varying Models: Paper No. MD-23-1397

Athul Sundarrajan, Yong Hoon Lee, James Allison, Daniel Zalkind, Daniel Herber

Research output: Contribution to journalArticlepeer-review

1 Scopus Citations

Abstract

This paper discusses a framework to design elements of the plant and control systems for floating offshore wind turbines in an integrated manner using linear parameter-varying models. Multiple linearized models derived from aero-elastic simulation software in different operating regions characterized by the incoming wind speed are combined to construct an approximate low-fidelity model of the system. The combined model is then used to generate open-loop, optimal control trajectories as part of a nested control co-design strategy that explores the system's power production and stability using the platform pitch tilt as a proxy in the context of crucial plant and control design decisions. The radial distance between the central and outer columns and the diameter of the outer columns of the semisubmersible platform are the plant design variables. The platform stability and power production are studied for different plant design decisions. The effect of plant decisions on subsequent power production and stability response of the floating wind turbine is quantified in terms of the levelized cost of energy. The results show that the inner-loop constraints and the plant design decisions affect the turbine's power and, subsequently, the cost of the system.
Original languageAmerican English
Number of pages12
JournalJournal of Mechanical Design
Volume146
Issue number4
DOIs
StatePublished - 2024

NREL Publication Number

  • NREL/JA-5000-85823

Keywords

  • alternative energy system design
  • conceptual design
  • control co-design
  • design optimization
  • floating offshore wind turbines
  • levelized cost of energy
  • linear parameter-varying models
  • optimal control
  • semisubmersible platforms
  • wind energy

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